Don't expect much from the asrock board. It kinda sucks.
I have 1.35v samsung eco-ram. I thought I'd be able to change the timings to 9-9-9-24 1T @ 1866 stock voltage like everyone else. The board won't boot with anything less than Jedec timings 11-11-11-28 2T 1600 @ 1.55v?? Make sure whatever ram you buy for this board is rated at the speed you want. Maybe I need to disable the "cool n quiet" feature in bios but that raises my temps 7 degrees C, and with a limitation on coolers, not worth it.
Another deal breaker, and this may just be my particular board. Something is wrong with the USB throughput. When the wireless wifi receiver is active, my usb mouse and keyboard start lagging to the point they're unusable. It's not 2.4ghz interference. I pulled the wireless receiver out, connected an external hard drive to the usb 3.0 port, and started transfering files. The same mouse and keyboard lag appears. USB speeds are pretty slow too, and asrock xfast usb makes them slower.
CPU-Z lists the chipset as A55, which is either wrong, or asrock is falsely advertising sata 3 since A55 is only capable of sata 2.
If you can wait until December-January, Gigabyte is releasing a FM2 ITX board around that time. The asrock, like the FM1 version before is pretty weak.
Edited by mach9 - 11/5/12 at 4:04pm